It's funny, isn't it, about instant recall of songs long assumed forgotten.

I've kept a list of just titles of each song I've learnt since the mid 60s. Some of which I now have no idea about. I remember a period back then when I would learn 3 songs a week to keep my floor spot fresh, I can't do that any more. However, a couple of years ago, a few of us in Cardiff felt we had been complacent about our respective repertoires and decided to debut a new song each per month at our local club, we kept it up for over a year.
It was a really useful exercise for me as I now have 3 distinct repertoires to keep fresh.

I remember a letter in Melody Maker many years ago from Don MacLean responding to a critical article about him in a previous issue, in which, as an aside, he claimed to be able to recall upwards of 6000 songs. Now THAT's a memory!